Go to Mauville city and get the acro bike then pess the b or a(i dont know which)button near the bike bridge to make it jump!
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u cannot do that unlike pokrmon ruby and sapphire
While on your bike simultaneously press B and the desired direction.
On the Acro Bike, press B and the arrow on the D-Pad you want to move in. It may take some practice to master.
the only way to jump on bike is to jump of a cliff!
Use the Acro Bike to pass the straight white lines to pass gaps use the bike jump technique.